class_docstr: A ready-to-use Response Generator  model
  
  The class can be used to generate and continue dialogue given the user input.
  The given YAML must contain the fields specified in the *_NEEDED[] lists.
  It needs to be used with custom.py to load the expanded  model with added tokens like bos,eos, and speaker's tokens.
docstr: Users should modify this function according to their own tasks.
docstr_tok: ["Users","should","modify","this","function","according","to","their","own","tasks","."]
code: def prepare_input(self):
      """Users should modify this function according to their own tasks."""
      raise NotImplementedError
  
imports: import torch
  from itertools import chain
  from speechbrain.inference.interfaces import Pretrained, EncodeDecodePipelineMixin
label_desc: Use image node_id 3 for calling the ResponseGenerator obj's underlying member method code with example usage: obj.prepare_input() without return types